diff options
Diffstat (limited to 'sys/arch/i386/stand/libsa/gidt.S')
| -rw-r--r-- | sys/arch/i386/stand/libsa/gidt.S | 76 |
1 files changed, 67 insertions, 9 deletions
diff --git a/sys/arch/i386/stand/libsa/gidt.S b/sys/arch/i386/stand/libsa/gidt.S index cf1810edb00..1653a0d21d9 100644 --- a/sys/arch/i386/stand/libsa/gidt.S +++ b/sys/arch/i386/stand/libsa/gidt.S @@ -1,4 +1,4 @@ -/* $OpenBSD: gidt.S,v 1.2 1997/04/07 01:21:54 weingart Exp $ */ +/* $OpenBSD: gidt.S,v 1.3 1997/04/09 08:39:37 mickey Exp $ */ /* * Copyright (c) 1997 Michael Shalayeff @@ -35,10 +35,13 @@ #include <machine/psl.h> #define _LOCORE #include <machine/segments.h> +#include <machine/specialreg.h> #include <machine/trap.h> #include <debug_md.h> #undef _LOCORE +#define addr32 .byte 0x67 +#define data32 .byte 0x66 .data .globl _Gdtr @@ -52,7 +55,7 @@ gdt: .word 0xFFFF # lolimit .word 0 # lobase .byte 0 # midbase - .byte SDT_MEMERA | 0 | 0x80 # RWXA, dpl = 0, present + .byte SDT_MEMERAC | 0 | 0x80 # RXAC, dpl = 0, present .byte 0xf | 0 | 0x40 | 0x80 # hilimit, xx, 32bit, 4k granularity .byte 0 # hibase /* 0x10 : flat data */ @@ -66,8 +69,8 @@ gdt: .word 0xFFFF # lolimit .word 0 # lobase .byte 0 # midbase - .byte SDT_MEMERA | 0 | 0x80 # RWXA, dpl = 0, present - .byte 0xf | 0 | 0 | 0 # hilimit, xx, 16bit, byte granularity + .byte SDT_MEMERA | 0 | 0x80 # RXAC, dpl = 0, present + .byte 0x0 | 0 | 0 | 0 # hilimit, xx, 16bit, byte granularity .byte 0 # hibase _Gdtr: .word . - gdt - 1 .long gdt @@ -127,28 +130,36 @@ idt: /* IDTENTRY(xx); IDTENTRY(xx); IDTENTRY(xx); IDTENTRY(xx) IDTENTRY(xx) /* Maskable interrupts(32-255) */ + /* BIOS entry points (32-63) */ +#define IBIOS(n) IPROC(bios/**/n) +#define IDTBIOS(n) IDTENTRY(bios/**/n) + IDTBIOS(0); IDTBIOS(1); IDTBIOS(2); IDTBIOS(3); IDTBIOS(4) + IDTBIOS(5); IDTBIOS(6); IDTBIOS(7); IDTBIOS(8); IDTBIOS(9) + IDTBIOS(10); IDTBIOS(11); IDTBIOS(12); IDTBIOS(13); IDTBIOS(14) + IDTBIOS(15); IDTBIOS(16); IDTBIOS(17); IDTBIOS(18); IDTBIOS(19) + IDTBIOS(20); IDTBIOS(21); IDTBIOS(22); IDTBIOS(23) + /* DOS entry points */ _Idtr_prot: - .word . - idt + .word . - idt - 1 .long idt .text - .globl alltraps #define IENTRY(name,type) \ IPROC(name): \ pushl $type ; \ - jmp alltraps + jmp 1f #define IENTRY_ERR(name,err,type) \ IPROC(name): \ pushl $err ; \ pushl $type ; \ - jmp alltraps + jmp 1f IPROC(xx): pushl $1 pushl $256 - jmp alltraps + jmp 1f IENTRY_ERR(de,0,T_DIVIDE) IENTRY_ERR(db,0,T_TRCTRAP) @@ -169,3 +180,50 @@ IENTRY_ERR(mf,0,T_ARITHTRAP) IENTRY(ac,T_ALIGNFLT) IENTRY(mc,T_MACHK) + .globl alltraps +1: /* save on jumps */ + jmp alltraps + +#define IBIOSENT(n) IBIOS(n): pushl %eax; movb $n, %al ; jmp 1f + +IBIOSENT(0); IBIOSENT(1); IBIOSENT(2); IBIOSENT(3) +IBIOSENT(4); IBIOSENT(5); IBIOSENT(6); IBIOSENT(7) +IBIOSENT(8); IBIOSENT(9); IBIOSENT(10); IBIOSENT(11) +IBIOSENT(12); IBIOSENT(13); IBIOSENT(14); IBIOSENT(15) +IBIOSENT(16); IBIOSENT(17); IBIOSENT(18); IBIOSENT(19) +IBIOSENT(20); IBIOSENT(21); IBIOSENT(22); IBIOSENT(23) + + .text + .globl _real_to_prot, _prot_to_real +1: + movb %al, intno + popl %eax + pushal + pushl %ds + pushl %es + + call _prot_to_real + + movl %di, %es + + int $0 +intno = . - 1 + + movb %ah, %bh + lahf + xchgb %ah, %bh + + data32 + call _real_to_prot + + /* pass BIOS return values back to caller */ + movl %eax, 0x9*4(%esp) + movl %ecx, 0x8*4(%esp) + movl %edx, 0x7*4(%esp) + movb %bh , 0xc*4(%esp) + + popl %es + popl %ds + popal + iret + |